Pastor Matt, if you can find a tachometer (could be part of an old style motor analyzer or something similar), get your idle speed set for around 475 to 500 rpm first. Then set your idle mixture. If you have your idle mixture screw out too far you may think it is good but this can fool you. Too much and you'll just run too rich at idle. If you can find a simple timing light (you probably can borrow one of each of these from an O'Reilly's or AutoZone), check both using those. If you can find a vacuum gauge, that can reveal all sorts of things, also. As others have said idling rich is not uncommon. You could change the main jet size. For us that is a mystery at this point. Please let us know what size you currently have.
